wp-fractional-scale-v1 to allow clients to submit buffers with a non-integer scale factor matching the output.
This hopefully means Sway and similar will support real fractional scaling for applications, not just the compositor fractional scaling we already have.
But I don’t know much about application support. Qt and Electron might support it; GTK 4 does not, possibly in a future version).
tearing-control to allow clients to opt-in for tearing page-flips.
That’s great for those who need it. Anyone with a modern display should probably just use variable refresh rate (vrr), but even today some devices don’t support it. E.g. there’s been 240Hz laptops without vrr.